# 首先创建一个列表，其中包含一些要打印的设计。
unprinted_designs = ['phone case','robot pendant','dodecahedron']
completed_models = []

# 模拟打印每个设计，直到没有未打印的设计为止。
# 打印每个设计后，都将其移到列表completed_models中。
while unprinted_designs:
    current_design = unprinted_designs.pop()
    print(f"Printing model:{current_design}")
    completed_models.append(current_design)

# 显示打印好的所有模型。
print("\nThe following models have been printed:")
for completed_model in completed_models:
    print(completed_model)


def print_models(unprinted_designs,completed_models):
    """
    模拟打印每个设计，直到没有未打印的设计为止。
    打印每个设计后，都将其移到列表completed_models中。
    """
    while unprinted_designs:
        current_design = unprinted_designs.pop()
        print(f"Printing model:{current_design}")
        completed_models.append(current_design)

def show_completed_models(completed_models):
    """显示打印好的所有模型。"""
    print("\nThe following models have been printed:")
    for completed_model in completed_models:
        print(completed_model)

unprinted_designs = ['phone case','robot pendant','dodecahedron']
completed_models = []

print_models(unprinted_designs[:],completed_models)
show_completed_models(completed_models)
print(unprinted_designs)